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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f047077107d72427e45f1b7707c3442d73d51a8da73dda6743bcba7f41b258' 
  AND token = 'BoA3pXFB6QlTRlzmmXajovK9c50SE3D/GFpZN3Q6aQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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