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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1a8df03e7b9b23702f631a45f2a5c53be5781baf610f18ffa3b74ee8a13792' 
  AND token = 'S7OeFBgdyYc2m57KvkPqYQ0WmNxZ44uo85wJ4RMLLfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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