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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d3028e9b1c430641cd5f398260b7970fbbd930edc70568fd2d6085fdc599f2' 
  AND token = 'Whk+32++SG/SFvLo2PGcCM2nZHKvELaf9hCMPj+oRyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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