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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea3fb19eb87c590012470df183bd753ca38470d424dc0b4ad15ad584e861bd6' 
  AND token = 'wroroJQEWpP+tb8YF1lD6htBvCb99sfG1otAsDNAOOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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