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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b186fd5c1ddf08be1cbb1c35d513a1679d553c97f2d89195e1e41f5faebf143' 
  AND token = 'YKvm8Qfu38uzWT66TqlicgxYFFtglpM+aokawlkwVGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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