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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e273a1cbf2e53e1d86a27c1d780272895fa8021ffc7b46be57a1484116753e6e' 
  AND token = 'cAc4XDrYkKfyqQpRPUJCWEvHXnaxwtkYjykoi3WMgew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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