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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ddb45dbb2d07abe8594418d2976c385bd6da69b6bb20b748be5f89a307215f' 
  AND token = 'g6uDNctMlZ2wJnPV05Ss1lldnIB+Tu5p4ZlTRBcCNhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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