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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e74ec3ea186d21735efdeb5a70ecd1f2d33037cdd5847fab0fc1273763f26d' 
  AND token = 'cZxbXBp45QuTAw0rBiuP3Ueq2yjiAsisE9vNTy6+jdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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