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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50cc6a7428e052e1e388e06881c69bbc9b21ccec3058369ff36163774310d517' 
  AND token = '2kY5l+1QtqMMkaAFQ8NcoiHi2zwiCNI0WDZhJXt8KfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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