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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba78aa167288dbd9e87824f4c1fe0b6ca437e4ff581d7883aa3e88deea2d38a0' 
  AND token = 'd0RCmeU7stMFFKp72poZrZo3H04DXTjW3aWtRYPRMJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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