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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ab13687bb5a0b675188f8e5eb9fe7e14be918fe0bb43a2e0b20adbe0aa4dda' 
  AND token = '5CKl8oxxQkaGs2A/22zJA8pcmzXcbiO8wxQlzokFEjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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