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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fb622f41f7743dde2fac2b1f878210b418cb2124e3f6f53bbbd3bf820ec69d' 
  AND token = 'dvK0P36DjEPqY7imc7VoXiiCptNVJTBkJrtnLTYq3hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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