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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0c139575dbaef110e41655193d7ba204fdb9a8778a9fc348d98260315c9090' 
  AND token = 'f/S7DNJnR3fsThTrfTWKfzjXgYlDBvOOio5KZP358C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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