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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da94d98285778ec6a46ba109a0ae1b3f80cf9b8ee6606c81214f86023cc01383' 
  AND token = 'bTsN7Fpqqbp6NlgdrH/UrG1oI1dR8uhPrtsOwKWttGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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