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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bad080d3d9b7aa69e14a7db14bbe8f23e758736da9f6eb51a3ce69b4386f9d' 
  AND token = 'wch4ty/T89OxGzzCs4ts4wKC8yAua2hezMbaZQxb7Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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