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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1f3e904b447457ea8adb16872bcf90b7ed161c31a8d37a69d5d7b1d3b6c73c' 
  AND token = '+GfEMJhxk2bS2UwmdCes9MwFnJZAxzO4srATPGkbhAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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