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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c858595d086608894481c2de1e2c6ef6c121f982909752fdafbd1ed9a47d9ff5' 
  AND token = '+Ah+BImE0qHFuan36F3XOPvVSfe2tnM6Ueq6kugsiVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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