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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a1ee43f7ec2d63a07bb68400cab01fa97e74289b28655a078594900411d5a6' 
  AND token = '/IHa6fW+S2OfclBblvjIQ42KAXLlwnl8gZ9/9Rnq+kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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