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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edf880099a25039d4f4d79a2c48a25a4da625c8aed2902af271eab2a55747a9' 
  AND token = 'szRAKhS89Zx1NbIckGrluZ1V3piOn5MmEcAP5EOfRy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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