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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8becc5c9e7689713dacf0706a51b7784e1e0364869a6a4de25604f3fa7baa10' 
  AND token = 'mZrWHxS1E35NBNNexlWcFnhMRGS4jJqAM8GLJpwqvnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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