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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5306bbbb510c3079885127e5f8a192bb8dfa42bd11e06701bb44d3f904b9e213' 
  AND token = 'aS53rIIqFmDX5T+nmROOruedmdqlGDIuI61awfeJce4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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