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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abef01f33c820213c78b3d334c36d8c5176bd9375d3fd00d7038a381cb763f77' 
  AND token = 'Iejs2qfpBC8/lMc9k74TXdmn/O9e+ZpMqM+xFzw1EVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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