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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6ad3fb06f6c62adf399b2ca2e69ff9103f1039c64aee7a4c4d7c4b538df00f' 
  AND token = 'B//rsCqiyXMEmOmuZ8K3kqVQBkGtJtK4HxLqQvrb8Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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