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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabb6da75d222e9379767a0d8595db6b7dbb3172b3b11fdf381114b06c462a52' 
  AND token = 'zkBZqDWpEw6Rt3SrJK/2ZXdtDqgTuWb+betUOAcdCyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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