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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04d39877f5dc418d85b68faf7b4771b2611f0957f2094d86b0d475084988247' 
  AND token = 'mwmXdEuDtHo45GrDm50lwT90lpvl3zPt1gYR2W0Vf2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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