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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e9e840af6c1d4627f7a551786f460d721be957d9b365aa53de52988da12f35' 
  AND token = 'ccN6nPm7yqeC7b1cOcw7EP7L/T5QWOQEJN4OyNlX9hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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