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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26a0106370671f011797ad315a45fcaa943e21b5b528dfec426921b4eecfa27' 
  AND token = '5stMBO1EQJKRunyMCmMRqVLVeRcww2oLwmy16owbaK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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