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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4fd1f9deff35ecf900f120853ce6e3141e449c2bed1bf2ae330b2cf0793d24' 
  AND token = '/lllL5UgW8JgQh0i6GK4oCpCioO3Fnh8mNUSCTy4EBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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