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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fcf8d8c5673d6511ecddee63c3b54978372137e65382db847093e4a59f0775' 
  AND token = 'Jf3BDS1aGB4ej3/KzjO+Ko9pBDldecRK3+bX1B2tbBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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