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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3751a8a096a4f0bf54c62892566f1d5193fe58dc25e15bcee1c018bb8b5e5d46' 
  AND token = 'vzZpN1qJtb8qb+B7kvCNEAeGgt5e80qDyd0qow0Hf8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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