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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b381842d5e90fb989a04f149a884f0fcb7b33a2e2f66c512e8d4c484ac1e83' 
  AND token = '3UFTXbp5yZTcy+QwmM2+yrCF5yZMNst3iVXemGfMBLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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