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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2cd5d2be8d57a48fee822772267b4cf4afb57b5248581534617b3f2e855ae4' 
  AND token = 'T4cOz0nu9Unz1680OCUvu+T6Gan7NRXc0SaUCY3R5UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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