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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1e4b3313a0fea10750006fd666bee4f6adaaa953625e9078df97ac3b555625' 
  AND token = 'H/oTnceLPgtXejNx2w5cmkHuTGeBG4B8Ekt5nbzTyi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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