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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2059843e623265135651b92d2ec0856bf1720a1c74f550004a0a20d25c6ddf5' 
  AND token = 'p09doBOqmRuUN044iNjopzG1F58jsoa+U5uUWB1Hb8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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