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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2231af986693274e563a4974d7172bbdc127d01a404218e6dbc03e0b9782c6c4' 
  AND token = 'phrkErWfK96txkk7/XqWhFWc7ziRAvDnkTi2CaY66ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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