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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd8a8eda86c57b0b8a754977b4a83375f1bb44850d2bdc0ca6cffad413549cd' 
  AND token = 'cXFWPAK7FI5po3P8/Upl5inK1jr9GK5YEN1qY9Eophw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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