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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa17ccb4d11ca6f0a0a2e2814a1bd5c1dbebb187e892979fee13742eecb68cfa' 
  AND token = 'fv3IQs3fekPATAcQIMNgh/9x2Jh5qNZFRkhXrQqGGVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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