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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7783e32081094d81f8490b16f36f757f0e6e7e2aa46ab236a46d35af8e97a47' 
  AND token = 'R9guZkIrBR+4G2F0hVz/BPuAFZMfM5752Jd6mVVQtGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00790

JSON explain

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