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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4700bc9cf1a5e59220730f52e75fdcb00385687cdde136543396a3480c55855' 
  AND token = 'iIOL4kN6ud9BLn78t96WMVzosyI7gBztwLcQPwTSIfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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