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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37525daf75a7aa9b9233db8a437a0edb0aba4c4a79c7a3914781db0e0616d767' 
  AND token = 'KYOB3ZhtG4+1UQNuDLYydUQivoNHg0tI4QMTDlU9F+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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