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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b087f9067c44f3b06e6fe97820f590b7ea10899a2283620a1eb076e25db051ad' 
  AND token = 'W+yP2jt0VWcL4lTwtG3rQGUafCz7KxKFn5wsKDRe4/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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