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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b58c4c1972ef07ff9e7f1855505b31ab898c2652d452f3aab374e540e816b9' 
  AND token = 'A3F+6mo5FYfVF5BMWnVVjYCZAkG/ChmSi8I2nntM04Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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