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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e1b10077ec2ba168fc47f7e06f15944d69e0e1bf47753028b0ae956212d126' 
  AND token = 'R3Ocak/4Zf1zVNOqPiNOQ9T+shjXNeB6kMOloclb3d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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