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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ab2260573449a0cfd7b2959eda011f60cbacda9343ac49e3992eff8d9a4cbe' 
  AND token = '+jSrA1j/8Xu+XH2grw7Sgx5WjLJNgpAj9roMLWfSvdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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