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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c5e63f2d800022e426a88c2936c782b95da9ec89a1dec9ee2ab3540e1156a3' 
  AND token = 'qiGfSd4eGoSFJn8IjhoBwqoxc2wiPCri9NScKFH/6M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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