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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0d52e5ee751a736de36617932c79097545538fe4b410e1ef2fc9edc20e5453' 
  AND token = 'awhM3Ua4ug5AP6iarp5KR6cEztvmKwlX8N5F7U69riY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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