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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daa0f5b1244d712867681dd7d2f2cc81ec28ae3a03e1bdbaeb1bac26f228320' 
  AND token = 'ErrgxYL2ghxuDb4VoR0gDyiaEnltDobG2ZojwD79bW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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