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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50aedb4da91bf942b47c258200fd519d5b3ffeb26e906d704d2974112571e5ad' 
  AND token = '/tuwVBVA5SBa2iFcJxTK17448Y9T1/94Sj/eeYEH85k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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