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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6a8252cb7b373dce378182fba96c781637e2df6d5e2764b6f7b2a1acf7ea6b' 
  AND token = 'oCkoQEfv2s10gYt7d5VlCg79t3yX0SOtd6RsgnuxnOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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