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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36c134a856d668e5b799c17bd359651a97ebffdb886eb830c0c47e93bdba868' 
  AND token = 'sQq4wS+CC1U7PoEv0lTQMPYXtwndp1UwIJuIFikNKfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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