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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129fa01340c01c54e42f061e44bedb98a5c6ce688a8beeaf1cee4952dd1c2d3e' 
  AND token = 'S7Nwyh+crSZ0ncPi9XljgxIusxHn9C7i2Tjs+fOAyY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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