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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7921d0c6f64de37cecad2938d324dce55977f70dbdf00d77083048f652fcc1' 
  AND token = 'G6bEur04bYG3IuzUzIFgaP77HyVuXGRRmIztaRoDeyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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