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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158b1453e888025d9e0b0918e2a201fd2b501c7ed39efe416d5b481de7326c76' 
  AND token = 'vivXGgChtuB1CGtVRBF55Qwv8RMsbbdR4gS1/ffY42c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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