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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ce38ff20793dc8da4feb89089ba455b583b0278f72689a6041dda14aa0027a' 
  AND token = 'YWntzc2uRfBckl3WF/W+E8x7bc7PlzHX/TCA/3Fbt60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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