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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e83ddc3b70c43ee168ed3919d1e110d67a57c387aa0dd81b0d584b24abf0015' 
  AND token = 'SbEgfhx3NVAKWVQuS4rMM9wajovcpz5buy8eBBa9MtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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