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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6973ced82d04918aad18f1d14d73d70021e4e9e7d9679147621946fdb7daae33' 
  AND token = 'C38Gf2mPJFV7xdzHNrsRZxFNc0Xf+J2YiWD77xIk2NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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