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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fac93ace8ff1f18ae72e84a7a6198a05b13a5113ebb349f78f99e1b1834710' 
  AND token = 'hsULvu+NsOpoIR5T1GI42MtlNhlPCnXlQEO3QE+PU9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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