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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2767ba6120025e235343187e58b9cbffbfff4a6984826fe7918c8a8d3b4d24fa' 
  AND token = 'F+MI2cT5woJar6qlTjl47BiwTLf62NLvIsnzze4r8xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}