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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb1e7ecc405828599e8ef3b7da6dd6bad4f72ea170af130cc73e4f109935e36' 
  AND token = 'ciKu9rTu2cMu25P1LvjT9opDVCk5fITABVzzjbuG0ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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