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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabaeff09b051854d8556719d0fa754ac17867a525a3de238f515ca32953d36f' 
  AND token = 'jfsufeBOlvyIBQwROiHjMDHRpS+7HfUp71c7jUariEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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